Metrohm 892 User Manual
892 Professional Rancimat
Manual
8.892.8001EN / 2014-05-09
Metrohm AG
CH-9100 Herisau
Switzerland
Phone +41 71 353 85 85
Fax +41 71 353 89 01
info@metrohm.com
www.metrohm.com
892 Professional Rancimat
8.892.8001EN / 2014-05-09
Manual
fpe
Teachware
Metrohm AG
CH-9100 Herisau
teachware@metrohm.com
This documentation is protected by copyright. All rights reserved.
Although all the information given in this documentation has been
checked with great care, errors cannot be entirely excluded. Should you
notice any mistakes please send us your comments using the address
given above.
Documentation in additional languages can be found on
http://documents.metrohm.com.
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Table of contents
1 Introduction 1
1.1 Instrument description ......................................................... 1
1.2 About the documentation ................................................... 2
1.2.1 Symbols and conventions ........................................................ 2
1.3 Safety instructions ................................................................ 3
1.3.1 General notes on safety ........................................................... 3
1.3.2 Electrical safety ........................................................................ 3
1.3.3 Flammable solvents and chemicals ........................................... 5
1.3.4 Recycling and disposal ............................................................. 5
2 Overview of the instrument 6
2.1 Front of the instrument ........................................................ 6
2.2 Rear of the instrument ......................................................... 7
Table of contents
2.3 Instrument display ................................................................ 8
3 Installation 10
3.1 Setting up the instrument .................................................. 10
3.1.1 Packaging .............................................................................. 10
3.1.2 Checks .................................................................................. 10
3.1.3 Location ................................................................................ 10
3.2 Mounting accessories ......................................................... 11
3.2.1 Mounting the internal air supply ............................................ 11
3.2.2 Mounting the external air supply ........................................... 13
3.2.3 Assembling the reaction and measuring vessels ..................... 14
3.2.4 Inserting vessels / Establishing tubing connections ................. 17
3.2.5 Mounting the exhaust air collection tube ............................... 18
3.2.6 Mounting the oil separator .................................................... 19
3.3 Power socket ...................................................................... 21
3.3.1 Replacing fuses ...................................................................... 21
3.3.2 Power supply cable and power socket ................................... 22
3.3.3 Switching the instrument on and off ...................................... 22
3.4 Connecting a computer ...................................................... 23
3.4.1 Connecting the 892 Professional Rancimat and the com-
puter ..................................................................................... 23
4 Operation 25
892 Professional Rancimat
4.1 Rancimat method ............................................................... 25
4.2 Calibration functions .......................................................... 26
4.2.1 Determining the cell constant ................................................ 26
4.2.2 Determining the temperature correction ................................ 27
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III
Table of contents
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4.3 Determinations ................................................................... 30
4.3.1 Preparing a sample ................................................................ 30
4.3.2 Preparing the instrument and the accessories ......................... 34
4.3.3 Preparing the determination .................................................. 35
4.3.4 Cleaning the accessories ........................................................ 37
4.3.5 Cleaning the oil separator ...................................................... 38
5 Operation and maintenance 40
5.1 General notes ...................................................................... 40
5.1.1 Care ...................................................................................... 40
5.1.2 Maintenance by Metrohm Service .......................................... 40
5.2 Replacing the dust filter .................................................... 41
5.3 Regenerating or replacing the molecular sieve ............... 41
5.4 Quality management and qualification with Metrohm .. 42
6 Troubleshooting 43
6.1 Problems ............................................................................. 43
7 Technical specifications 48
7.1 General data ....................................................................... 48
7.2 Temperature control and measurement .......................... 48
7.3 External temperature sensor ............................................. 49
7.4 Conductivity measurement ................................................ 49
7.5 Gas flow regulation ............................................................ 50
7.6 USB interface ...................................................................... 50
7.7 Power socket ...................................................................... 50
7.8 Safety specifications ........................................................... 50
7.9 Electromagnetic compatibility (EMC) ................................ 51
7.10 Ambient temperature ......................................................... 51
7.11 Dimensions/Material .......................................................... 51
8 Conformity and warranty 52
8.1 Quality Management Principles ........................................ 52
8.2 Warranty (guarantee) ......................................................... 53
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IV
9 Accessories 55
Index 57
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Table of figures
Figure 1 Front 892 Professional Rancimat ........................................................ 6
Figure 2 Rear 892 Professional Rancimat ......................................................... 7
Figure 3 Instrument display ............................................................................. 8
Figure 4 Mounting accessories for the air supply ........................................... 11
Figure 5 Drying flask - Individual parts ........................................................... 12
Figure 6 Drying flask mounted in place ......................................................... 13
Figure 7 Equipping the reaction and measuring vessels ................................. 15
Figure 8 Mounting the air tube: correct - incorrect ........................................ 17
Figure 9 Mounting the foam barrier .............................................................. 17
Figure 10 Mounting the oil separator .............................................................. 20
Figure 11 Instrument display with instrument name ........................................ 22
Figure 12 Instrument display with "no connection" symbol ............................. 22
Figure 13 Instrument display without instrument name and symbol ................ 23
Figure 14 Instrument display with serial number ............................................. 23
Figure 15 Measuring arrangement (schematic representation) ......................... 26
Figure 16 Assembling the reaction vessel for determining the temperature correc-
tion ................................................................................................. 28
Figure 17 Oil separator (6.2753.200), disassembled ........................................ 38
Figure 18 Dust filter - conditions ..................................................................... 41
Table of figures
892 Professional Rancimat
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1 Introduction
1.1 Instrument description
The 892 Professional Rancimat is a computer-controlled measuring device
for determining the oxidation stability of samples containing oil and fat.
It is equipped with two heating blocks each with 4 measuring positions.
Each block can be heated individually, i.e., 4 samples can each be measured at two different temperatures or 8 samples at the same temperature. The measurements at the individual measuring positions can be
started individually for this.
The 892 Professional Rancimat is controlled by means of the StabNet
computer software and a computer that is connected via the USB interface. Up to 4 instruments can be controlled and monitored by each computer, hence allowing a maximum of 32 samples to be analyzed at the
same time. The evaluation algorithm of the computer software determines
the break point of the Rancimat curve and thus the induction time fully
automatically. Besides the induction time, the so-called stability time,
i.e., the time until a defined conductivity change has been achieved, can
also be determined. In the case of conductivity changes (stages) which do
not have anything to do with the autoxidation, the evaluation can be suspended for definite time intervals. The results determined can be further
processed mathematically. In particular, the induction times can be converted to the standard temperatures defined in the respective standards.
1 Introduction
Each Rancimat curve can also be evaluated manually. A computer-supported tangential method is available for this, in which you can position
the tangents anywhere on your curves. This makes evaluations possible in
extreme cases as well.
The results of the determinations are saved in a database together with all
method and determination data. Determinations can be searched for,
sorted, filtered, exported and printed in the Database program part.
Apart from graphically displaying individual and multiple curves, the software is also capable of conducting recalculations with changed parameters and extrapolating the results to a certain temperature.
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1
1.2 About the documentation
1.2 About the documentation
CAUTION
Please read through this documentation carefully before putting the
instrument into operation. The documentation contains information
and warnings which the user must follow in order to ensure safe operation of the instrument.
1.2.1 Symbols and conventions
The following symbols and formatting may appear in this documentation:
Cross-reference to figure legend
The first number refers to the figure number, the second to the instrument part in the figure.
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Instruction step
Carry out these steps in the sequence shown.
Method Dialog text, parameter in the software
File ▶ New Menu or menu item
[Next] Button or key
WARNING
This symbol draws attention to a possible life-threatening hazard or risk of injury.
WARNING
This symbol draws attention to a possible hazard due
to electrical current.
WARNING
This symbol draws attention to a possible hazard due
to heat or hot instrument parts.
WARNING
This symbol draws attention to a possible biological
hazard.
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2
CAUTION
This symbol draws attention to possible damage to
instruments or instrument parts.
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1.3 Safety instructions
1.3.1 General notes on safety
WARNING
This instrument may only be operated in accordance with the specifications in this documentation.
This instrument has left the factory in a flawless state in terms of technical
safety. To maintain this state and ensure non-hazardous operation of the
instrument, the following instructions must be observed carefully.
Hot reaction vessels
1 Introduction
NOTE
This symbol highlights additional information and
tips.
The reaction vessels can become very hot.
Avoid any contact with the hot reaction vessels. Place these in the vessel holders provided for cooling down.
Flammable substances
The heating block of the 892 Professional Rancimat can be heated to
229.9 °C.
Flammable substances may ignite at such temperatures.
Adjust the oven's maximum heating temperature to the sample that is
to be analyzed.
1.3.2 Electrical safety
The electrical safety when working with the instrument is ensured as part
of the international standard IEC 61010.
WARNING
WARNING
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1.3 Safety instructions
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WARNING
Only personnel qualified by Metrohm are authorized to carry out service
work on electronic components.
WARNING
Never open the housing of the instrument. The instrument could be
damaged by this. There is also a risk of serious injury if live components
are touched.
There are no parts inside the housing which can be serviced or replaced
by the user.
Mains voltage
WARNING
An incorrect mains voltage can damage the instrument.
Only operate this instrument with a mains voltage specified for it (see
rear panel of the instrument).
Protection against electrostatic charges
WARNING
Electronic components are sensitive to electrostatic charges and can be
destroyed by discharges.
Do not fail to pull the mains cable out of the mains connection socket
before you set up or disconnect electrical plug connections at the rear
of the instrument.
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1.3.3 Flammable solvents and chemicals
WARNING
All relevant safety measures are to be observed when working with
flammable solvents and chemicals.
￭ Set up the instrument in a well-ventilated location (e.g. fume cup-
board).
￭ Keep all sources of flame far from the workplace.
￭ Clean up spilled liquids and solids immediately.
￭ Follow the safety instructions of the chemical manufacturer.
1.3.4 Recycling and disposal
This product is covered by European Directive 2002/96/EC, WEEE – Waste
from Electrical and Electronic Equipment.
The correct disposal of your old equipment will help to prevent negative
effects on the environment and public health.
1 Introduction
More details about the disposal of your old equipment can be obtained
from your local authorities, from waste disposal companies or from your
local dealer.
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2.1 Front of the instrument
1
2
3
4
5
6
7
8
2 Overview of the instrument
2.1 Front of the instrument
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Figure 1 Front 892 Professional Rancimat
Silicone tubing (6.1816.010)
1
For connecting the reaction vessel to the
measuring vessel.
Measuring vessel (6.1428.107)
3
FEP tubing 250 mm (6.1805.080)
5
For supplying air into the reaction vessel.
Reaction vessels (6.1429.040)
7
Measuring vessel cover (6.0913.130)
2
Contains an integrated conductivity measuring cell.
Instrument display
4
Displays the status of the instrument and the
individual measuring positions.
Reaction vessel cover (6.2753.107)
6
Start buttons
8
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6
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1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20
2.2 Rear of the instrument
2 Overview of the instrument
Figure 2 Rear 892 Professional Rancimat
Electrode connector
1
For connecting the conductivity measuring
cell integrated in the measuring vessel cover.
Power switch
3
For switching the instrument on and off.
I = ON / 0 = OFF.
Power socket
5
For important information on the power
connection, see Chapter 3.3.
Drying flask cap (6.1602.145)
7
Cap for the drying flask.
Drying flask (6.1608.050)
9
Drying flask filled with molecular sieve
(6.2811.000).
FEP tubing 130 mm (6.1805.010)
11
For connecting the Air out connector to the
Air/N2 in connector during normal opera-
tion with the internal air pump.
Air supply connector
2
For connecting the FEP tubing 250 mm.
Fuse holder
4
For replacing fuses (see Chapter 3.3.1, page
21).
Collection tube holder
6
For fastening the optional exhaust air collection tube (6.2757.000).
Bottle holder
8
For fastening the drying flask.
"Air out" connector
10
"Air/N2 in" connector
12
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2.3 Instrument display
892_1
1 2 3 4
9 8 7 6
10
5
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Type plate
13
Contains specifications concerning supply
voltage and serial number.
Dust filter (6.2724.010)
15
"To flask" connector
17
"From flask" connector
19
2.3 Instrument display
Pt100 connector
14
For connecting an external temperature sensor.
USB connector
16
For connecting the computer.
FEP tubing 250 mm (6.1805.080)
18
For supplying the air from the internal pump
to the drying flask.
FEP tubing 250 mm (6.1805.080)
20
For supplying the air from the drying flask to
the reaction vessels.
1
3
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8
Figure 3
Measuring vessel cover red
This measuring position is not available for a
determination (determination is running or
multiple determination has not yet been
completed).
Instrument name
The instrument name display corresponds to
the configuration in StabNet.
Instrument display
Measuring vessel cover green
2
A determination can be started on this measuring position.
Measuring vessel cover gray
4
This measuring position is not available for
starting a determination (instrument not
connected to computer or no method loaded).
892 Professional Rancimat
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2 Overview of the instrument
Conductivity display block B
5
Shows the measured conductivity.
Dash (-) is displayed = Conductivity cannot
be displayed (no sensor connected or no
valid measuring signal).
Temperature display block B
7
Shows the temperature measured on block
B (gray background: heater switched off; red
background: temperature not stable; green
background: temperature stable).
Gas flow display block A
9
Shows the gas flow measured on block A
(gray background: gas flow switched off;
white background: gas flow switched on).
Gas flow display block B
6
Shows the gas flow measured on block B
(gray background: gas flow switched off;
white background: gas flow switched on).
Temperature display block A
8
Shows the temperature measured on block
A (gray background: heater switched off;
red background: temperature not stable;
green background: temperature stable).
Conductivity display block A
10
Shows the measured conductivity.
Dash (-) is displayed = Conductivity cannot
be displayed (no sensor connected or no
valid measuring signal).
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3.1 Setting up the instrument
3 Installation
3.1 Setting up the instrument
3.1.1 Packaging
The instrument is supplied in highly protective special packaging together
with the separately packed accessories. Keep this packaging, as only this
ensures safe transportation of the instrument.
3.1.2 Checks
Immediately after receipt, check whether the shipment has arrived complete and without damage by comparing it with the delivery note.
3.1.3 Location
The instrument has been developed for operation indoors and may not be
used in explosive environments.
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Place the instrument in a location of the laboratory which is suitable for
operation and free of vibrations and which provides protection against
corrosive atmosphere and contamination by chemicals to the extent possible.
The instrument should be protected against excessive temperature fluctuations and direct sunlight.
NOTE
In order to improve accessibility of the measuring positions, the instrument can also be placed on the optionally available turning ring
(6.2059.000).
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892 Professional Rancimat
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1 2 3 4 5 6 7 8
9
10
11
12
3.2 Mounting accessories
3.2.1 Mounting the internal air supply
The gas in the 892 Professional Rancimat is normally supplied using the
internal air pump, which aspirates laboratory air. For air supply and
air purification, the following accessories must be mounted on the rear of
the 892 Professional Rancimat:
3 Installation
Figure 4 Mounting accessories for the air supply
FEP tubing 130 mm (6.1805.010)
1
"Air/N2 in" connector
3
"From flask" connector
5
"To flask" connector
7
Drying flask cap (6.1602.145)
9
Cap for the drying flask.
Bottle holder
11
For fastening the drying flask.
Mount the accessories for the air supply as follows:
"Air out" connector
2
Dust filter (6.2724.010)
4
FEP tubing 250 mm (6.1805.080)
6
For supplying the air from the drying flask to
the reaction vessel.
FEP tubing 250 mm (6.1805.080)
8
For supplying the air from the internal pump
to the drying flask.
Drying flask (6.1608.050)
10
Drying flask filled with molecular sieve
(6.2811.000).
Filter tube (6.1821.040)
12
1
Mounting the dust filter
￭ Insert the dust filter on the connector marked with Filter on the
rear of the 892 Professional Rancimat.
￭ If the laboratory air is heavily contaminated, a tubing for supply-
ing fresh air can be connected to the dust filter.
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3.2 Mounting accessories
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NOTE
The dust filter serves for filtering the air aspirated through the air
pump and must be replaced at periodic intervals (see Chapter 5.2,
page 41).
2
Mounting the drying flask
Drying flask cap (6.1602.145)
1
Bottle (6.1608.050)
3
Figure 5 Drying flask - Individual parts
Filter tube (6.1821.040)
2
￭ Fill the molecular sieve into the drying flask.
￭ Screw the filter tube on the bottom side of the drying flask cap
into the opening marked with a dot (on the upper side).
￭ Screw the drying flask cap with mounted filter tube onto the dry-
ing flask and insert it in the flask holder on the rear of the 892
Professional Rancimat.
￭ Screw one end of the FEP tubing 250 mm to the opening on the
drying flask cap marked with a dot.
￭ Screw the other end of the FEP tubing to the From flask connec-
tor on the rear of the 892 Professional Rancimat.
￭ Screw one end of the second FEP tubing 250 mm to the second
opening on the drying flask cap.
￭ Screw the other end of the second FEP tubing to the To flask
connector.
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892 Professional Rancimat
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